Quick releasing tricing block



Feb, 27, 1945. G, D NN 2,370,151

QUICK RELEASING PRICING BLOCK Filed May 19, 1959 5 Sheets-Sheet 1'INVENTOR JOSt'PH aou/v v ATTORNEY Feb, 27, ms.- J. G. DUNN 2,370,151

QUICK RELEASING TRICING BLOCK Filed May 19, 1939 5 Sheets-Sheet 2 29INVENTOR W JOSEPH G. DUNN W4 ATTORNEY Feb. 27, 1945. DUNN 2,370,151

QUICK RELEASING TRICING BLOCK INVENTOR BY J0$PH 5.0UNN

A'FTORNEY Feb. 27, 1945. J. G. DUNN 2,370,151

QUICK RELEASING TRICING BLOCK Filed May 19, 1959 5 Sheets-Sheet 4INVENTOR I, Y JOSEPH G.DUN/V ATTORNEY Feb; 27, 1945. Y a DUNN 2,370,151

QUICK RELEASING TRICING BLOCK Filed May 19, 1939 5 Sheets-Sheet 5INVENTOR BY JOSEPH G. DUNN ATTORNEY Patented Feb. 27, 1945 UNITED STATESPATENT OFFICE QUICK RELEASING TRICING BLOCK Joseph G. Dunn, Arlington,Va.

Application May 19, 1939, Serial No. 274,597

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 0. G. 757) Claims.

This invention relates to quick releasing tricing blocks, especiallyintended for facilitating the handling of aircraft or other objects uponairplane carriers, ships, hangars, or other stowage places.

A further object of this invention is to provide an improved quickreleasing tricing block which includes catch means for holding the loadin a raised, suspended position, free from the hoisting cable, and atthe same time includes means for quickly releasing the load and allowingit to be lowered by the hoisting cable.

In order to stow a maximum number of airplanes on board an airplanecarrier it is necessary and desirable to hoist and secure some of theplanes against the overhead, leaving the space therebelow free for otheruses or additional stowage. The planes stowed against the overhead areusually raised by block and tackle, and then after so raised they mustbe fastened securely against swaying to prevent damage. When thecustomary block and tackle is used the weight of the airplane or loadremains on the hoisting line while the airplane is being secured andafter it is secured. Due to the length of the hoisting line there is aptto be considerable stretch in the line and it is difficult to secure theairplane firmly in stowed position. It is customary for an operator tolash another line around the hoisting block so as to hold the airplaneas firmly as possible, which means that an operator must be raised withthe airplane in order to be in position to lash the block. With thisinvention the conventional block and tackle is eliminated in favor of atricing block which automatically relieves the hoisting line of any loadas soon as the airplane is raised to the overhead and at the same timehasa releasing means enabling the load to be transferred back to thehoisting line and loweredwithout the presence of an operator any nearerthan the floor above which the airplane is being stowed.

With the foregoing and other objects in view, the invention consists inthe construction, combination and arrangement of parts hereinafterdescribed and illustrated in the drawings, in which,

Fig. l is an elevational view of an airplane stowed against an overheadby means of the tricing blocks of, thi invention;

Fig. 2 is an elevational view of the tricing block with the catch infull up position;

3 is a view of the tricing block, including the releasing lever, withthe catch in extreme down position;

F 4 is a fragmentary detail view of the swivel I link looking in thedirection of the arrow 4 in Fig. 2;

Fig. 5 is a detail view of the catch in the direction of the arrow 5 ofFig. 2;

Fig. 6 is a partly sectional and partly elevational side view of thelatch;

Fig. 7 is a partly end view and partly sectional view on line 'l'! ofFig. 6;

Fig. 8 is a partly top and partly sectional view on line 88 of Fig. 6;

Fig. 9 is a partly sectional view of the latch jaw on line 9-9 of Fig.6;

Fig. 10 is an elevational view of the latch releasing mechanism;

Fig. 11 is an end view at arrow I l of Fig. 10; L

Fig. 12 i an end view at arrow 12 of Fig. 10;

Fig. 13 is a sectional view on line l3-l3 of Fig. 14 is a partlysectional and partly elevational view of the catch;

Fig. 15 is a detail view at arrow l5 of Fig. 14;

and

Fig. 16 is an elevational view of a modified suspending means dependingfrom the catch.

There is shown at 20 an airplane stowed near an overhead 2i through theuse of the tricing block 22 of this invention. The tricing block 22issuspended on a pivot bolt 23 from a header 24 which is somewhat bowed,as shown, and supported in lightening holes in the H-beams 25 of theoverhead 2!. Bolt 23 pivotally supports the U-shaped swivel link 26which has an eye bolt 21 secured therein through an aperture in itsbight 39 by a nut 28. The eye 29 of the eye bolt 21 supports a pin 30 onwhich is Supported sheave cheeks 3| and side links 32, the pin 3|] beingheld in position by nuts 33 and lock pins 34. Knobs 35 extending fromsheave cheeks 3| are secured by bolts 36 and nuts 31, thereby holdingthe sheave cheeks 3! rigid with respect to the side links 32. A sheaveaxle 38 sup-ports a grooved sheave wheel 40 between the sheave cheeks 3I, the hoisting rope 42 being reeved over the sheave wheel 40 andbetween the side links 32, where it terminates in a swage fitting 43threaded into the catch 44 and secured therein by a nut 45. The catch44, it will be observed, is shaped somewhat like an umbrella with abifurcated handle46, within which is pivotally mounted by means of thebolt 41 a sling block 48 somewhat Y-shaped in outline with a slingreceivinggroove 50 in the head thereof and an eye 5| in the leg thereof.

A sling line 52 secured to the aircraft 20 by means of a hoisting bar 53may be secured to the sling block 48 over the groove 50 or alternativelythrough the eye 5|. The forward part of the aircraft may be secured to asimilar tricing block 22 by means of the tackle line 54 on the aircraft20 being secured to its sling block 48.

The latch 55 for receiving and securing the catch 44 includes a pair oflatch jaws 56 pivoted on bolts .51 which pass throughthelatchhase 58.Also secured to the latchbase 58 bymeans of the bolts 51 are the sidelinks 32, which are enlarged, as at 60, to permit proper spacing of thebolts 5b: The latch base 58 is provided with a vertical aperture 6!permitting the hoisting rope 42 to pass therethrough and is providedwith. a seat, 62 against which the nut 45 of catch 44 may abut when thecatch member is in full ip position.

Each jaw 56 is provided with an angularfinger 62 cooperating with aspring pressed plunger '53 having a coil spring 64 anchored against the,threaded plug 65 and located in. .a,channel. 66 formed in the latch base58. This plungerfi; presses against the outstanding fin g'ers'62of thejaws 56 and urges them to the latching position shown in full lines inFig.5, but permitting them to pivot to the dash line po'sition' 56" whenthe jaws 56 are urged apart either the catch 44 passing upwardlytherethrough or by the release mechanism shown in Figs. lo ll'and '12.

Each of the jaw members56is provided with an apertured knob 61. A b'ellcrank releasing lever 68 is journaled ona bolt m passing through theapertured knob 61 of one jaw '56, while a releasing, link 1| issimilarly journaled on a bolt' 12 through the apertured knob of theother jaw. The releasing link TI is pivoted on a iloating pin 73 to the,bell crank arm l4 of the releasing lever 68, the end of'releasing lever58 havinga pull cable 15 mounted thereon. Pulling thecahle l5 downwardlycauses thereleasing lever 68 to move one of the jaw members 56 to theposition 56 against the spring plunger 53, and throughits bell crank armand floating pivot 13, releasing link H simultaneously moves the otherjawia similar distance. "Each of the jaws 56 'is lprovided with a lip l6which cooperates with adepending tongue 80 of the catch 44" forpositively holding the jaws in" down position when the' weight of thecatch member thereon. Before operating the pull cable l5 the hoistcable42 be operated to move the catch' memb er44 to the full upposition'shown in Fig. 2. As an alternative to the'sling block 48 thehoisting rope 42 instead of ending "in the fitting 43 may extendtherethrough'as 'at ill and be folded back about a. thimble 82 and heldin folded back positionby a plurality of clips 83, preferably five ormore being used. In this form the sling block 48 may be omitted, in Fig.16, by merely removingth'e pivot pin 4l, whereupon the thimble 82 servesto receive the sling line supporting load. i

In operation, the aircraft to be stowed near the overhead 2| has thecustomary tackle line 54 secured theretoadjacent its fore fpart, whileaft a hoisting bar 53 is inserted thro ugh the aft aperture customarilyprovided therefor, and has a sling line 52 secured thereto. Theislingline 1 52 and tackle line 54 are each attached to'the' sling block 48 inthe conventional mannenithe' slings 48 being secured to the bifurcations46 of the catch 44 by'the bolts 4l, as already de scribed. Thehoistinglines 42 of feach of the tricing blocks 22 are then'operatedmore or less simultaneously so as to raise the aircraft ZO on a more orless even keel. Each hoistline 42 -fas it passes around its sheave wheel40 causes its tricing block 22 to pivot about the supporting pin 23 inthe header 24 to the positions 22, the swivel links 26 moving to thepositions 26, while the side links 32 move to the vertical positionshown in Fig. 2. The hoist lines 42 are pulled by a winch or othersuitable source of power until the aircraft is raised and the catchmember 44 reachesv the full up position shown in Fig. 2, against theseat 45. As the catch 44 just approaches this position, the sloping top84 of the catch abuts against tapered depending bosses 85 on the jaws56, pressing the jaws 55 to the position ,56 against their springplungers B3, and thereby permitting the catch 44 to pass to thefullupposition shown in Fig. 2.

Immediately that the edges of the depending bosses of the catch 44 havepassed above the inner edges-of the jaws 56, the jaws 56 snap backto.the latching position so that when the tension on the hoist lines 42is slackenedofi the catch 44 returnsto the e'xtreme down positionrelative to thejaws 56, with the tongues 80 behindthe lips 16 of thejaws 56. Simultaneously, the tricing block 22 moves from the positionshown in Fig. 2 to that shown in Fig. 3 about the supporting 'pin 23,and the whole mechanism oi the tricing block and the aircraft move fromthe positions shown at 22 and 20 in Fig. l to the position shown at 22and 20. In this position the full weight of the aircraft is carriedsolely by the tricing blocks and no weight at all is held on thehoisting lines 42-.- As thus supported additiohal guy ropes and lashingsmay be placed aboutv the aircraft 2 0 to hold it immovably in stowedposition inthe customary manner. When it isdesired to remove theaircraft 20 from the stowed position, the lashings and guy ropes areremovedand the tension is applied to the hoist lines. 42 'to move thecatch 44 to the full up position shown in Fig. 2.

While, in this full up position, the lever cable 15 ;is operated to movethe jaws 56 to the open positionat56, and is held while the hoist lines42; is slackened oil to lower the aircraft away, the lever cable 15being released after the catch member 44 has emerged from between thelatch jaw s 56.;

Other modifications and changes in the proportionsand arrangements ofthe parts may be made by those skilled in the art without departing fromthe nature of the invention, within the scopeoi whatis hereinafterclaimed.

The inve ntion described herein may be manufactured and/ or used by orfor the Government of the United States of America for governmental,

purposes without the payment of any royalties thereon or therefor.

Having thus set forth and disclosed the, nature ofthisinvention, what isclaimed is:

1. A1tric ing block for raising and supporting a load in raisedposition, comprising a hoist line, a load supporting catch membersecured to said hoist line, a releasable latch member for receiving andholding said load supporting catch member in raised position, saidreleasable latch member including a pair of pivotally supported jawmember's, yieldable means holding said jaw members in catch supportingposition, and remote control means for holding said jaw members innon-supporting position.

2. ,A tricing blockifor releasably supporting a load, comprising a loadsupporting catch memher, a releasable catch supporting latch member,hoisting means for raising and lowering said catch'rnember to and fromsaid latch member,

said hoisting means comprising a sheave, a hoisting cable reeved oversaid sheave and through said latch member and secured to said catchmember, and universal pivoted means for supporting said sheave and catchmember, said universal supporting means comprising a swivel link,pivotal means supporting said swivel link, side link memibers secured tosaid swivel link, said sheave and said latch member being secured tosaid side link members.

3. Means for raising and releasably supporting a load, comprising apivotally supported swivel link, a swivel bolt depending from'saidswivel link, a pivoting pin secured to said swivel bolt, a pair of sidelink members supported on said pivot pin, a sheave comprising a pair ofsheave cheeks, asheave wheel, a sheave journal extending through saidsheave cheeks rotatably supporting said sheave wheel, said sheave cheeksbeing fixed to said side links, a latch member secured to said sidelinks, said latch member comprising a latch base, a pair of jaw memberspivotally secured to said latch base, yieldable means urging said jawmembers to latching position, remotely controllable releasing means formoving said jaw members to unlatching position, said latch base havingan aperture therethrough, a hoisting cable reeved through said latchbase aperture and over said sheave wheel and between said jaw members,and a load supporting catch member secured to said hoisting cable.

4. Means for raising and releasably supporting a load, comprising apivotally supported swivel link, a swivel bolt depending from saidswivel link, a pivoting pin secured to said swivel bolt, a pair of saidlink members supported on said pivot pin, a-sheave comprising a pair ofsheave cheeks, a sheave wheel, a sheave journal extending through saidsheave cheeks rotatably supporting said sheave wheel, said sheave cheeksbeing fixed to said side links, a latch member secured to said sidelinks, said latch member comprising a latch base, a pair of jaw memberspivotally secured to said latch base, yieldable means urging said jawmembers to latching position, remotely controllable releasing means formoving said jaw members to unlatching position, said latch base havingan aperture therethrough, a hoisting cable reeved through said latchbase aperture and over said sheave wheel and between said jaw members, aload supporting catch member secured to said hoisting cable, upstandinglips on said jaw members and depending tongues on said catch membercooperating with said lips to hold said catch member on said jawmembers.

5. Means for raising and 'releasably supporting a load, comprising apivotally supported swivel link, a swivel bolt depending from saidswivel link, a pivoting pin secured to said swivel bolt, a pair of sidelink members supported on said pivot pin, a sheave comprising a pair ofsheave cheeks, a sheave wheel, a sheave journal extending through saidsheave cheeks rotatably supporting said sheave wheel, said sheave cheeksbeing, fixed to said side links, a latch member secured to said sidelinks, said latch member comprising a latch base, a pair of jaw memberspivotally secured to said latch base, yieldable means urging said jawmembers to latching position, remotely controllable releasing means formoving said jaw members to unlatching position, said latch base havingan aperture therethrough, a hoisting cable reeved through said latchbase aperture and over said sheave wheel and between said jaw members, aload supporting catch member secured to said hoisting cable, upstandinglips on said jaw members and depending tongues on said catch membercooperating with said lips to hold said catch member on said jawmembers, a sloping top on said catch member, and cooperating angularsurfaces on the bottom of said jaw members whereby said catch memberwill move said jaw members apart as said catch member is hoisted towardlatching position.

' JOSEPH G. DUNN.

